Did Wargrave kill himself at the end in the book And Then There Were None?

He has a strong personality. Due to him being a retired judge it makes him very authoritative and he is a natural leader. He is very intelligent and commanding. he is also VERY assertive. At the end of the book he illuminates his motives for killing each person. He has a disease that makes him enjoy murdering and he can't stand the idea that no one will ever know how clever he was.